Enhanced UL rate violation detection

ABSTRACT

The present invention relates to a method for grant violation detection in an enhanced uplink (UL) telecommunication system. According to the method a radio network controller (RNC) establishes a first enhanced UL transport channel (E-DCH) which enables uplink data traffic with a certain data rate from a user terminal UE at least to a first base station. At least a first downlink transmission is performed to the user terminal UE including a first E-DCH. A Node B NB detects the scheduled data rate on which the user terminal UE transmits and further controls if the scheduled data rate detected is higher than the maximum data rate defined by the first E-DCH channel scheduled grant. If this is the case the Node B NB performs at least a second following downlink transmission including the first E-DCH channel scheduled grant.

TECHNICAL FIELD

The present invention relates to a method and a telecommunication systemfor grant violation detection, and Node B and a radio network controllerin the system enabling said method.

BACKGROUND

There is an increasing need of delivering wireless technology withbroadband capacity for cellular networks. A good broadband system mustfulfil certain criteria, such as high data rate and capacity, low costper bit, good Quality of Service and greater coverage. High Speed PacketAccess (HSPA) is an example of a network access technology that enablesthis.

HSPA is a collection of protocols which improves the performance ofexisting Universal Mobile Telecommunication Systems (UMTS), which is athird generation (3G) cell phone technology. UMTS uses Wideband CodeDivision Multiple Access (WCDMA) as air interface for the radio-basedcommunication between user equipment (UE), in form of a mobile terminal,and the base station (BS). The air interface in the Open SystemsInterconnection (OSI) model comprises layers 1 and 2 of the mobilecommunications system, establishing a point-to-point link between the UEand a radio access node (RAN).

WCDMA is a wideband spread-spectrum air interface that utilizes thedirect sequence Code Division Multiple Access (CDMA) signaling method toachieve higher speeds and support more users. Key features for WCDMAare:

-   -   Two 5 MHz radio channels for Uplink (UL) and Downlink (DL)        channels respectively.    -   Support two basis duplex modes, Frequency division (FDD) and        Time division (TDD).

HSPA is an integral part of WCDMA. Wide-area mobile coverage can beprovided with HSPA. It does not need any additional spectrum orcarriers. Currently, WCDMA can provide simultaneous voice and dataservices to users on the same carrier. This also applies to HSPA whichmeans that spectrum can be used efficiently. Simulations show that in amoderately loaded system, HSPA can largely reduce the time it takes todownload and to upload large files.

HSPA provides greater system capacity by for instance:

-   -   Shared-channel transmission resulting in efficient use of        available code and power resources in WCDMA in the downlink        (DL).    -   Fast scheduling prioritizing users with the most favourable        channel conditions.    -   16 Quadrature Amplitude Modulation (QAM) in the DL and the        uplink (UL) (as an option 64 QAM for the DL) which results in        higher bit-rates.

The primary benefits of HSPA are improved end-user experience. Inpractice, this means shorter UL and DL times as a result of higherbit-rates and reduced latency compared to earlier releases of WCDMA.HSPA also benefits operators by reducing the production cost per bit.More users can be served with higher bit-rates at lower productioncosts.

As with any telecommunication technology, end-user performance with

HSPA depends of the type of service and the behavior of higher-layerapplication protocols. Transmission Control Protocol (TCP) used forpacket data services includes slow start and mechanisms which influencethe performance, and the overall performance of the service much includethese mechanisms. For instance in web-browsing it could be TCP and notHSPA as air interface that limits the performance. In contrast toweb-browsing, TCP has very low impact on the time to download a largefile, which means the performance is largely determined by the data rateof the radio link. A single user downloading a large file can occupy asignificant amount of the total cell capacity.

HSPA is the set of technologies defining the migration path of WCDMAoperators worldwide. The two existing features, High Speed DownlinkPacket Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), inthe HSPA family provides the increased performance by using improvedmodulation schemes and by refining the protocols by which handsets andbase stations communicate. These improvements lead to the betterutilization of the existing radio bandwidth provided by UMTS.

High Speed Downlink Packet Access (HSDPA) is the first feature withinHSPA. It is part of the WCDMA Third Generation Partnership Project(3GPP) Release 5 specification. HSDPA provides a new downlink transportchannel that enhances support for high-performance packet dataapplications. It represents the first step in the evolution of WCDMAperformance. HSDPA can deliver an up to 35 fold increase in downlinkdata rates of standard WCDMA networks, enabling users to access theInternet on mobile phones and laptops, at speeds previously associatedwith fixed line DSL.

HSDPA is based on shared channel transmission, which means that somechannel codes and the transmission power in a cell are seen as a commonresource that is dynamically shared between users in the time and codedomains for a more efficient use of available codes and power resourcesin WCDMA. The radio channel conditions experienced by different downlinkcommunication links vary significantly, both in time and betweendifferent positions in the cell.

To compensate for rapidly varying radio conditions in the downlink,HSDPA relies on bit-rate adjustment. That is, while keeping transmissionpower constant, it adjusts (by lowering) the data rate by adjusting themodulation.

High Speed Uplink Packet Access (HSUPA) is the second feature withinHSPA. It is part of the WCDMA Third Generation Partnership Project(3GPP) Release 6 specification. HSUPA provides a new uplink (UL)transport channel called Enhanced Dedicated CHannel (E-DCH). HSUPAdramatically increases the uplink data traffic rate. This technology islikely to significantly increase the amount of data uploaded over mobilenetworks, especially user-generated content. Although a lot of isdownlink oriented, there are still quite a number of applications thatwill benefit from an improved uplink. These include the sending of largee-mail attachments, pictures, video clips, blogs etc. HSUPA is alsoknown as Enhanced UL.

In contrast to HSDPA, the new uplink channel that is introduced forEnhanced Uplink is not shared between users, but is dedicated to asingle user.

FIG. 1 shows a HSUPA network overview. A user terminal UE communicateswith the core network CN via at least one base station 11. The systemfurther comprises a second base station 10 with a corresponding systemwhich will be described later. A first radio network controller RNC 12establishes an E-DCH which enables uplink data traffic from the userterminal to the base station. The E-DCH carries data for at least oneradio network bearer. The term “lu” in FIG. 1 represents the interfacebetween RNC and core network. Sometimes the abbreviations lu-ps andlu-cs are used to indicate connection to packet switched or circuitswitched core networks. The term “lub” represents the interface betweenRNC and the radio bases station (RBS).

Several new physical channels are added to provide and supporthigh-speed data transmission for the E-DCH. As shown in FIG. 1, two newcode-multiplexed uplink channels are added:

-   -   E-DCH Dedicated Physical Data Channel (E-DPDCH)    -   E-DCH Dedicated Control Channel (E-DPCCH)

E-DPDCH carries the payload data, and the E-DPCCH carries the controlinformation associated to the E-DPDCH. E-DPDCH is used to carry theE-DCH transport channel. There may be zero, one or several E-DPDCH oneach radio link wherein there is at most one E-DPCCH on each radio link.

E-DPDCH and E-DPCCH are always transmitted simultaneously. E-DPCCH shallnot be transmitted in a slot unless E-DPDCH is also transmitted in thesame slot.

Similarly, three new channels, see FIG. 1, are added to the downlink forcontrol purposes:

-   -   E-DCH Hybrid Automatic Repeat Request (HARQ) Indicator Channel

(E-HICH) carrying the uplink E-DCH hybrid Acknowledgement (ACK) andNegative ACK (NACK) indicator. The Node B can request retransmissions oferroneously received data packets and will send for each packet eitheran acknowledgement (ACK) or a negative acknowledgement (NACK) to the UE.

-   -   E-DCH Absolute Channel (E-AGCH) carrying absolute grants, which        means that it provides an absolute limitation of the maximum        amount of uplink resources the UE may use. It is a fixed rate        downlink physical channel carrying the uplink E-DCH absolute        grant.    -   E-DCH Relative Grant Channel (E-RGCH) carrying the uplink E-DCH        relative grants, which means that it controls the resource        limitations by increasing or decreasing the limitations with        respect to the current serving grant. The relative grants (RG)        are used in the scheduling process to incrementally adjust the        allowed UE transmit power. A UE can receive and combine one        relative grant from all the E-RGCHs transmitted within the        serving radio link set.

The E-DCH Transmission Time Interval (TTI) can be either 2 ms or 10 msin length. E-AGCH is only transmitted from the serving cell. E-RGCH andE-HICH are transmitted from radio links that are part of the servingradio link set and from non-serving radio links.

As shown in FIG. 1 the same E-DCH can be provided both through the firstRNC 12 for the serving cell and through a second RNC (RNC2) 13 for thenon-serving cell. The second RNC 13 serves a separate base station 10with a Node B NB2 and an enhanced UL scheduler (EUL-S2) (will bedescribed later). Except for E-AGCH (which can only be transmittedthrough the serving cell) all the physical channels can be transmittedthrough either of the cells. As an alternative one RNC can serve both aserving cell and a non-serving cell. The term “lur” in FIG. 1 representsthe interface between the first RNC 12 and the second RNC 13. Only oneRNC will communicate with the core network (i.e. the first RNC). Thefirst RNC is in control of the connection and handles things like softHO.

The RNC can take the role of serving or drifting. These does not relateto the concept of serving cell or serving radio link RL. The serving RNCis the RNC which acts as the “anchor point” between the radio accessnetwork RAN (the radio base station and Node B) and the CN. The servingcell is the best cell in the active set according to some criteria andcan belong either to the serving (S-RNC) or the drifting (D-RNC) RNC.

Note that HSUPA channels are added on top of uplink/downlink dedicatedchannels. Each UE therefore additionally carries an uplink and downlinkdedicated physical channel (DPCH), see FIG. 1. In the downlink, afractional dedicated channel (F-DPCH) can be used alternatively. TheF-DPCH carries control information and is a special case of downlinkDedicated Physical Control Channel (DPCCH). UL might only contain theDPCCH as in FIG. 1. It could also contain a Dedicated Physical DataChannel (DPDCH). These have been introduced in 3GPP release 6 in orderto optimize the downlink codes usage.

HSUPA scheduling is provided by an enhanced UL scheduler (EUL-S) locatedin the Node B, see FIG. 1, close to the air interface, but it operateson a request-grant principle where the UE requests a permission to senddata and the scheduler decides when and how much data an UE is allowedto send and also how many UEs will be allowed to do so. The EUL-S islocated in the Node B in order to move processing closer to airinterface and be able to react faster on the radio link situation.

The fast scheduling is used in HSUPA enables rapid resource reallocationbetween UEs, exploiting the ‘burstiness’ in packet data transmissions.Tasks of the uplink scheduler are to control the uplink resources thatthe UE in the cell are using. The scheduler therefore grants maximumallowed HSUPA transmission. This effectively limits the transport blocksize the UE can select and thus the uplink data traffic rate. It enablesthe system to admit a larger number of high-data rate users and rapidlyadapts to interference variations—leading to an increase both incapacity and the likelihood that a user will experience high data rates.

The scheduling mechanism is based on absolute and relative grants. Theabsolute grants are used to initialize the scheduling process andprovide absolute transmit power ratios to the UE, whereas the relativegrants are used for incremental up- or downgrades of the allowedtransmit power. The absolute grant is carried by the downlink physicalchannel E-AGCH and the relative grant is carried by the downlinkphysical channel E-RGCH. The grants are used as a maximum transmissionlimit on the uplink transmission channel E-DCH. The grants can beconverted to the scheduled rate.

Different scheduling strategies can be implemented. This flexibility isuseful, as different environments and traffic types can have differentrequirements on the scheduling strategy. A UE can, for instance, bescheduled from just one base station or from several base stations atthe same time.

Macro diversity is exploited for HSUPA, i.e. the uplink data trafficpackets can be received by more than one cell. There is one serving cellcontrolling the serving radio link assigned to the UE. The serving cellis having full control of the scheduling process and provides theabsolute grant to the UE. The serving radio link set is a set of cellscontaining at least the serving cell and possibly additional radio linkswith common RG generation. The UE can receive and combine one relativegrant from the serving radio link set. There can also be additionalnon-serving radio links. The UE can have zero, one or severalnon-serving radio links and receive one relative grant from each ofthem.

In addition to the scheduled mode of transmission (E-AGCH and E-RGCH)the standards also allows a self-initiated transmission mode from theUEs, named non-scheduled. The non-scheduled mode can, for example, beused for Voice IP (VoIP). The UE adjusts the data rate for scheduled andnon-scheduled flows independently. The maximum data rate of eachnon-scheduled flow is configured at Radio Link Setup and/or Radio LinkReconfiguration procedure, and typically not changed frequently.

As a basic principle of the uplink scheduling mechanism, the UEmaintains a serving grant which represents the maximum E-DPDCH powerratio the UE may use in the next transmission. The available uplinkpower determines the possible data rate. The absolute grant allows theNode B scheduler to directly adjust the granted rate of UEs under itscontrol. It is used to initialize the serving grant. The relative grantsare used to incrementally adjust the UE's serving grants. As an input tothe scheduling, UE feedback is required. The UE has the possibility tosend scheduling information which provides detailed information aboutthe buffer status in the UE. Therefore, the Node B scheduler can makeappropriate scheduling decisions.

It happens that the UE does not obey its grant and thereby transmit at atoo high data rate. This can happen for faulty UE or due to that the UEdidn't detect the downlink E-AGCH and E-RGCH physical channels carryingthe grant data. Moreover, the UE can always transmit the non-scheduledpart according to network configuration and it is only the scheduledpart that the Enhanced UL scheduler controls.

This is currently a problem in WCDMA Radio Access Network (RAN). UEsometimes transmit on too high rate, which causes disturbances in thecell. This rate is higher than the rate granted by the scheduler. Thescheduler repeating the grant could help, if the UE hear the repeatedgrant. However, if it is transmitted on the same power level, it mightfail again. Just increasing the downlink power every time the E-RGCH orE-AGCH is transmitted is too costly. Still, if the repeating of thegrant does not help, something needs to be done with the UE, since thetransmitting on a too high rate could seriously disturb the cell.

WO 2006/51867 discloses a mobile communication system in which the UE isinstructed to lower the bit rate of E-DCH data channel when the receivedelectrical power of E-DCH is too high. A non-serving cell sends anE-RGCH to instruct the UE to lower the transmission rate of E-DCH whenreceived electric power of E-DCH is high. The problem with this systemis that there is no method of handling a situation when the UE does notchange the power after the E-RGCH has been sent.

SUMMARY

The object of the present invention is to solve the above problem by amethod and a telecommunication system for grant violation detection, andan enhanced uplink scheduler and a radio network controller in thesystem enabling said method.

In order to solve the above-mentioned problems the present inventionrelates to a method for grant violation detection in an enhanced uplinktelecommunication system. The system comprises at least one first basestation for enabling wireless communication with at least one first userterminal. According to the method at least one first radio networkcontroller establishes at least a first enhanced UL transport channel(E-DCH) which enables uplink data traffic with a certain data rate fromthe first user terminal at least to the first base station. The firstE-DCH carries data for at least one radio access bearer. At least afirst downlink transmission is performed to the first user terminal. Thetransmission includes a first E-DCH channel scheduled grant. Thescheduled grant defines the maximum data rate limit for the uplink datatraffic via the first E-DCH.

According to the method the first user terminal calculates from thereceived first E-DCH channel scheduled grant a scheduled data rate forthe uplink data traffic via the first E-DCH. The first user terminaltransmits the uplink data traffic on the first E-DCH with the calculatedscheduled data rate. A Node B then detects the scheduled data rate onwhich the first user terminal transmits.

What particularly characterizes the method is that the Node B furthercontrols if the scheduled data rate detected is higher than the maximumdata rate defined by the first E-DCH channel scheduled grant. If thescheduled data rate detected is higher than the maximum data rate, theNode B performs at least a second following downlink transmissionincluding the first E-DCH channel scheduled grant.

In order to solve the above-mentioned problems the present inventionalso relates to a Node B which is adapted for grant violation detectionin an enhanced UL telecommunication system. The system further comprisesat least one first base station for enabling wireless communication withat least one first user terminal.

At least a first enhanced UL transport channel (E-DCH) is establishedwhich enables uplink data traffic with a certain data rate from thefirst user terminal at least to the first base station. The first E-DCHcarries data for at least one radio access bearer. At least a firstdownlink transmission is further performed to the first user terminal.The transmission includes a first E-DCH channel scheduled grant. Thescheduled grant defines the maximum data rate limit for the uplink datatraffic via the first E-DCH. The Node B is further adapted for detectinga scheduled data rate on which the first user terminal transmits uplinkdata traffic on the first E-DCH,

What particularly characterizes Node B is that it is adapted to controlif the scheduled data rate detected is higher than the maximum data ratedefined by the first E-DCH channel scheduled grant. If the scheduleddata rate detected is higher than the maximum data rate, the Node B isfurther adapted to perform at least a second following downlinktransmission including the first E-DCH channel scheduled grant.

In order to solve the above-mentioned problems the present inventionalso relates to a first radio network controller (RNC) in an enhanced ULtelecommunication system, which is adapted for grant violationdetection. The system further comprises at least one first base stationfor enabling wireless communication with at least one first userterminal. The at least one first RNC is adapted for establishing atleast a first enhanced UL transport channel (E-DCH) enabling uplink datatraffic with a certain data rate from the first user terminal at leastto the first base station. The first E-DCH carries data for at least oneradio access bearer.

At least a first downlink transmission is further performed to the firstuser terminal. The transmission includes a first E-DCH channel scheduledgrant. The scheduled grant defines the maximum data rate limit for theuplink data traffic via the first E-DCH. What particularly characterizesthe first RNC is that it is further adapted for receiving a failureindication or a radiolink reconfiguration proposal sent to the first RNCafter initiation by a Node B.

Finally, in order to solve the above-mentioned problems the presentinvention also relates to an enhanced uplink telecommunication systemadapted for grant violation detection. The system comprises at least onefirst base station for enabling wireless communication with at least onefirst user terminal. An at least one first radio network controller isadapted to establish at least a first enhanced UL transport channel(E-DCH) which enables uplink data traffic with a certain data rate fromthe first user terminal at least to the first base station. The firstE-DCH carries data for at least one radio access bearer. At least afirst downlink transmission is performed to the first user terminal. Thetransmission includes a first E-DCH channel scheduled grant. Thescheduled grant defines the maximum data rate limit for the uplink datatraffic via the first E-DCH.

The first user terminal is adapted to calculate from the received firstE-DCH channel scheduled grant a scheduled data rate for the uplink datatraffic via the first E-DCH. The first user terminal is further adaptedto transmit the uplink data traffic on the first E-DCH with thecalculated scheduled data rate. A Node B is adapted to then detect thescheduled data rate on which the first user terminal transmits.

What particularly characterizes the system is that Node B is adapted tocontrol if the scheduled data rate detected is higher than the maximumdata rate defined by the first E-DCH channel scheduled grant. If thescheduled data rate detected is higher than the maximum data rate, theNode B is further adapted to perform at least a second followingdownlink transmission including the first E-DCH channel scheduled grant.

One advantage with the present invention is that the enhanced uplinkscheduler performs following downlink transmissions which give the userterminal a new chance to detect the grant.

Another advantage is that in order to save downlink power, Node B doesnot use more power than necessary. When a grant violation has beendetected, where it is assumed that the user terminal did not hear thedownlink transmission, the downlink power level can be increased at therepeated following transmissions. This handling saves downlink power,which should as much as possible be used to downlink data, likededicated physical channel (DPCH) and HSDPA. The alternative to alwaysincrease the downlink power will be costly.

A further advantage is that if the user terminal for some reason doesnot detect a relative or absolute grant despite the increased power, theterminal can be removed from E-DCH configuration and thereby not causesany further interference in the cell.

BRIEF DESCRIPTION OF DRAWINGS

In the following text the invention will be described in detail withreference to the attached drawings. These drawings are used forillustration only and do not in any way limit the scope of theinvention:

FIG. 1 shows a HSUPA network overview.

FIG. 2 shows a flow chart for the grant violation detection andtransmission of downlink transmissions.

FIG. 3 shows the downlink power level at transmittal of non-repeatedrespectively repeated grants.

FIG. 4 shows the downlink power level at transmittal of non-repeatedrespectively repeated grants for the case when the power level is rampedup.

FIG. 5 shows a sequence diagram with the interaction between the firstRNC (12), Node B (NB) and the user terminal (UE).

FIG. 6 shows a sequence diagram with the interaction between the firstRNC (12), Node B (NB) and the user terminal (UE) where in indicatedfailure leads to a reconfiguration from E-DCH to DCH.

FIG. 7 shows a sequence diagram with the interaction between the firstRNC (12), Node B (NB) and the user terminal (UE) where in indicatedfailure leads to a reconfiguration from E-DCH to FACH.

FIG. 8 shows a sequence diagram with the interaction between the firstRNC (12), Node B (NB) and the user terminal (UE) where in indicatedfailure leads to a E-DCH release.

FIG. 9 shows a sequence diagram with the interaction between the firstRNC (12), Node B (NB) and the user terminal (UE) where in a RABconfigure request leads to a reconfiguration from E-DCH to DCH.

DETAILED DESCRIPTION

The invention will now be described in detail with reference toembodiments described in the detailed description and shown in thedrawings.

The embodiments refer to a method and a telecommunication system forgrant violation detection and a Node B and a radio network controller,in the system enabling said method. The system, Node B and the radionetwork controller in the system are adapted to perform the method stepsas described in the method. It should be understood by a person skilledin the art that the fact the system and in particular the system partsperform a method step means that it is adapted to perform said step.

FIG. 1 shows a HSUPA network overview. A user terminal UE communicateswith the core network CN via a base station 11. A first radio networkcontroller RNC 12 establishes an E-DCH which enables uplink data trafficfrom the user terminal to the base station, the first E-DCH carryingdata for at least one radio access bearer (RAB).

The present invention relates to a method for grant violation detectionin an enhanced uplink (UL) telecommunication system, corresponding to aHSUPA system. The HSUPA system comprises at least one first base station10 which enables wireless communication, with a first or more userterminals UE. The system further comprises a second base station 10 witha corresponding system which will be described later.

A first radio network controller RNC 12 establishes (more than one RNCcan be involved) at least a first enhanced UL transport channel (E-DCH)which enables uplink data traffic with a certain data rate from thefirst user terminal UE to the first base station 10. The RNC mayestablish E-DCH channels also to other base stations. The E-DCH carriesdata for at least one radio access bearer (RAB). The E-DCH is used fordata and control signalling between the user terminal UE and the corenetwork CN, when the data transmission starts.

At least a first downlink transmission is performed including a firstE-DCH channel scheduled grant to the first user terminal (UE), thescheduled grant defining the maximum data rate limit for the uplink datatraffic via the first E-DCH.

The first RNC 12 performs a first downlink transmission including aradio link (RL) setup or reconfiguration channel scheduled grant to thefirst user terminal UE during a RL setup or reconfiguration, before theestablishment of the first E-DCH.

In practice, the first RNC 12 configures Node Bs and UEs via radio link(RL) setup/reconfiguration procedures. Then the E-DCH transport channelis configured. The E-DCH can have non-scheduled MAC-d flows (e.g.signalling radio bearer (SRB) used to transmit configuration data to theUE, via the RRC protocol) and these can have a non-scheduled grant,which means this can always be sent. The E-DCH typically also contain ascheduled MAC-d flow (e.g. Interactive service) which can have aninitial scheduled grant (SG) (can be zero), but the amount oftransmission of this MAC-d flow is under the control of the Scheduler,communication via absolute grants (AG) and relative grants (RG).

A Node B NB, which comprises an enhanced UL scheduler (EUL-S), performsa first downlink transmission including a first E-DCH channel scheduledgrant to the first user terminal. There may be more than one Node B inthe system performing said step. The scheduled grant defines the maximumscheduled data rate limit for the uplink data traffic via the firstE-DCH. The details of the channel scheduled grant will be describedlater.

The EUL-S is part of the Node B NB, see FIG. 1, which means that it isclose to the air interface (WCDMA in HSUPA). It operates on arequest-grant principle, where the user terminal UE requests apermission to send data and the scheduler decides when and how much dataa user terminal is allowed to send and also how many user terminals thatwill be allowed to do so. The EUL-S is located in the Node B NB in orderto move processing closer to the air interface and be able to reactfaster on the radio link situation. A particular task of the uplinkscheduler is to control the uplink resources, which the user terminal isusing.

Node-B is a term used in UMTS to denote the base transceiver station(BTS). In contrast with GSM base stations, Node B NB uses WCDMA as airinterface. As in all cellular systems, such as UMTS and GSM, Node Bcontains transmitter(s) and the receiver(s) used to communicate directlywith the mobiles, which move freely around it. Presently, the Node Bshas minimum functionality is controlled by the RNC. Node B transmitssignals to RNC. EUL-S as part of Node B triggers E-AGCH/RGCHtransmissions to the user terminal, but the decoding and the actualtransmission of E-AGCH/RGCH is handled within the Node B. In thefollowing text Node B is described to perform certain procedure, but inpractice some procedures by the EUL-S being part of the Node B.

The first user terminal UE calculates a scheduled data rate for theuplink data traffic via the first E-DCH from the received first E-DCHchannel scheduled grant. How the scheduled data rate is calculated willbe described in relation to the characteristics of the channel scheduledgrant. After calculation the first user terminal transmits the uplinkdata traffic on the first E-DCH, with the calculated scheduled datarate. This means that Node B NB by sending the E-DCH channel scheduledgrant can instruct the user terminal about which data rate it is allowedto use.

The Node B NB detects 1B the scheduled data rate, on which the firstuser terminal transmits in order to control the cell load and the riskof interference in the cell. This is shown in FIG. 2 which shows a flowchart for the grant violation detection and transmission of scheduledgrants on the downlink. The scheduling enables the system to admit alarger number of high-data rate users and rapidly adapt to interferencevariations in the cell—leading to an increase both in capacity and thelikelihood that a user will experience high data rates. It also enablesthe system to control that the cell interference are not so high that itcauses disturbances in the cell.

The main problem which this invention focuses on is that the userterminal UE sometimes transmits on a too high data rate, which causesdisturbances in the cell. This rate is higher than the rate granted bythe scheduler. Something needs to be done with the user terminal sincethe transmitting on a too high rate could seriously disturb the cell.

The present invention solves the above problem by the method steps wherethe Node B NB first controls 2, see FIG. 2, if the scheduled data ratedetected is higher than the maximum data rate SG EUL-S defined by thefirst E-DCH channel scheduled grant. If the scheduled data rate detectedis higher than the maximum data rate, see point 3 in FIG. 2, the Node BNB performs 4 at least a second following downlink transmissionincluding the first E-DCH channel scheduled grant. If the scheduled datarate detected is equal with or lower than the maximum data rate nofollowing transmission is performed, see point A.

The current invention as disclosed provides a control mechanism to makesure that the scheduling decisions are really handled by the userterminal UE. The downlink transmission with the E-DCH channel scheduledgrant is repeated, which gives the user terminal a new chance to detectthe scheduled grant. It is only repeated when the scheduled data ratedetected is higher than the maximum data rate, which means that it isonly repeated when necessary.

The first RNC 12 establishes at least one second E-DCH enabling uplinkdata traffic, with a certain data rate from a second user terminal tothe first base station or a second base station. The Node B NB performsa first transmission including a second E-DCH channel scheduled grant tothe second user terminal, the scheduled grant defining the maximumscheduled data rate limit for the uplink data traffic via the secondE-DCH. This means that there may be more than one E-DCH in the system,for instance between the second user terminal and the first or a secondbase station. There can only one E-DCH for each user terminal whichmeans that the second E-DCH must be established between a secondterminal and the network. The person skilled in the art will thereforerealize that the method according to the present invention can beperformed for more than one E-DCH.

As shown in FIG. 1 the same E-DCH can be provided both through the firstRNC 12, for the serving cell and through a second RNC (RNC2) 13 for thenon-serving cell. The second RNC 13 serves a separate base station 10with a Node B NB2 and an enhanced UL scheduler (EUL-S2) (will bedescribed later). Except for E-AGCH (which can only be transmittedthrough the serving cell) all the physical channels can be transmittedthrough either of the cells. As an alternative one RNC can serve both aserving cell and a non-serving cell. The term “lur” in FIG. 1 representsthe interface between the first RNC 12 and the second RNC 13. Only oneRNC will communicate with the core network (i.e. the first RNC). Thefirst RNC is in control of the connection and handles things like softHO.

The E-DCH transport channel is mapped by the E-DCH Dedicated PhysicalChannel (E-DPDCH), see FIG. 1. The E-DPCCH carries the layer 1 controlinformation associated to the E-DPDCH. E-DPDCH is used to carry theE-DCH transport channel. E-DPDCH and E-DPCCH are always transmittedsimultaneously. E-DPCCH shall not be transmitted in a slot unlessE-DPDCH is also transmitted in the same slot.

It should be understood by a person skilled in the art that thefollowing steps disclosed from now on, as performed by Node B (NB) 11can simultaneously be performed by the second Node B (NB2) 10. Thesesteps are performed without control by any of the radio networkcontrollers RNC 12 and RNC2 13.

At least the Node B NB detects the scheduled data rate on the firstE-DCH by decoding the data frames of the uplink data traffic. The E-DCHtransport block with data is mapped onto one Transmission Time Interval(TTI).

The Node B NB detects the scheduled data rate of the uplink data trafficon the E-DCH by decoding the E-DPDCH and/or the E-DCH Transport FormatCombination Indicator (E-TFCI). One of E-DPDCH and E-TFCI or both areused to derive the actual data rate. E-TFCI is a value indicating thesize of (i.e. how many bits are contained in) the transport block—thepayload unit sent on E-DCH in one TTI.

If the scheduled data rate is higher than the maximum data rate afterthe second following transmission at least the Node B NB performs, atleast a third following downlink transmission including the first E-DCHchannel scheduled grant, see point 4 in FIG. 2. See also FIG. 5 whichshows a sequence diagram with the interaction between the first RNC 12,Node B NB and the user terminal UE. In FIG. 5, point 1A represents thefirst downlink transmission performed by the Node B. Point 2 (FIGS. 2and 5) represents the control if the scheduled data rate detected ishigher than the maximum data rate. If the scheduled data rate detectedis higher than the maximum data rate, see point 3 (FIGS. 2 and 5), theNode B performs 4 (FIGS. 2 and 5) at least a second following downlinktransmission including the first E-DCH channel scheduled grant.

In FIG. 5 it is also illustrated that at least Node B NB waits for aperiod of time, point B, after performing a downlink transmission, afterwhich period it controls again 2 if the scheduled data rate detected ishigher than the maximum data rate defined by the first E-DCH channelscheduled grant and whether 3 it should perform 4 a followingtransmission.

As shown in FIGS. 2 and 5, at least the Node B NB continues to repeat 4the downlink transmissions more than one time, all the repeatedtransmissions are named “following transmissions”. The third followingdownlink transmission 4 may be followed by at least one furtherfollowing downlink transmission 4 including the first E-DCH channelscheduled grant.

The following downlink transmissions are optionally repeated until,point 5 NO/A (FIG. 2), the scheduled data rate detected is equal with orlower than the maximum data rate. There is likelihood that the firstuser terminal UE finally received the first E-DCH channel scheduledgrant and recalculated the scheduled data rate for the uplink datatraffic.

As an option the third following downlink transmission 4 is followed byat least one further following downlink transmission until the number offollowing downlink transmissions reaches a predefined value. This meansthat at least the Node B NB continues to repeat the downlinktransmissions until the predefined value is reached, which may be apre-stored value for instance set by the operator via a systemmanagement user interface.

As an option the following downlink transmission is transmitted at leastby the

Node B NB, with the same or a higher power level than the previoustransmission. Repeating the transmission and particularly withincreasing power increases the likelihood that the user terminal UE candetect the first E-DCH channel scheduled grant. The downlinktransmission is then followed by at least one further following downlinktransmission including the first E-DCH channel scheduled grant until thepower level reaches a threshold value.

FIG. 3 shows the downlink (DL) power level (Watt) at transmittal ofnon-repeated respectively repeated scheduled grants, with increasingpower level. As shown in the figure the solid line illustrates theoption of estimating the power level over time for initial channelscheduled grants, based on prediction of the radio channel or any otherDL power control procedure. The estimation is based on the radioconditions, e.g. good radio conditions results in lower power and viceversa. According the 3GPP, 25.414, the E-AGCH and E-RGCH power controlis under control of the node B NB. It may e.g. follow the power controlcommands sent by the UE to the node B or any other power controlprocedure applied by the node B.

The power level of a repeated scheduled grant transmission isillustrated with dotted lines in FIG. 3. It is derived from the currentestimated initial power level plus Xn (see also FIG. 4). The reason forincreasing the power level is that the level of the default setting isnot sufficient for enabling the user terminal to detect the scheduledgrant. Normally increasing values are used for x1, x2, x3 . . . xn.However, other values may also be possible, e.g. setting 0 meansrepetition without added power.

FIG. 4 shows the downlink (DL) power level (Watt) at transmittal ofnon-repeated respectively repeated scheduled grants for the case whenthe power level is ramped up from a fixed value represented by the solidline bar. The bars represent the repeated following downlinktransmissions according to the present invention. According to theoption with increased power level, FIG. 4 shows the first transmissionwith the fixed value and the repeated following transmissions (dottedline bars), wherein the power is ramped up from the fixed value.Normally increasing values are used for x1, x2, x3 . . . xn. However,other values may also be possible, e.g. setting 0 means repetitionwithout added power. The invention includes all these value settings.The ramped power level is also illustrated in FIG. 5 with x1, x2 and soforth in brackets.

It will now be described what happens if the scheduled data rate, aftera predefined number of following downlink transmissions or after thetransmitted power level reaches a threshold value, is still higher thanthe maximum data rate defined by the first E-DCH channel scheduledgrant. This is for instance after the number of downlink followingtransmissions reaches a predefined value. It may also be that the powerlevel reaches a threshold value. As a further alternative the repeatingof downlink transmissions has continued for a predefined period of time.

In the following text, Node B (NB) 11 or Node N (NB2) 10 is in contactwith only the first RNC 12. The second RNC (13) is transparent and onlyforwards the information.

The Node B NB initiates 6 (see FIGS. 2 and 5) the sending of a failureindication or the sending of a radiolink reconfiguration proposal to thefirst RNC 12. A failure indication can be sent for other causes, and inthis case the cause for the indication can be called “user terminal notreacting on scheduled grants”. This is not the case for the radiolinkreconfiguration proposal, which is a new kind of signal. Still the causefor the request can be called “user terminal not reacting on scheduledgrants”.

There are four alternative solutions how the handle the situation whenthe scheduled data rate is still higher than the maximum data ratedefined by the first E-DCH channel. These are shown in FIGS. 6-9.

In two alternatives, see FIGS. 6 and 9 at least one RAB is reconfiguredby the first RNC 12 from the first E-DCH to a first dedicated channelDCH. The first

RNC 12 makes the decision when receiving the failure indication 6 a (1)or the radiolink reconfiguration proposal 6 d (1). The first RNC 12 thenreconfigures at least by sending a reconfigure control signal to theNode B NB 6 a (3)/6 d (3) and the user terminal UE 6 a (2)/6 d (2), withinstructions to switch from the first E-DCH to the first DCH.

In one alternative, see FIG. 7, the at least one RAB is reconfigured bythe first RNC 12 from the first E-DCH to a first forward access channel(FACH). The first RNC 12 makes the decision when receiving the failureindication 6 b (1). The first RNC 12 then reconfigures at least bysending a reconfigure control signal to the Node B NB 6 b (3) and theuser terminal UE 6 b (2), with instructions to switch from the firstE-DCH to the first FACH.

The user terminal UE can at any time transmit short packages at theRandom Access Channel (RACH) for UL or the FACH for DL. If data is notsmall then there is a switch to DCH or E-DCH, which in both cases meansthat the first RNC 12 sends a radio link (RL) Setup to Node B NB and theuser terminal. DCH has a fix limit, e.g. 64 kbps service. Then on bothUL and DL max 64 kbps can be sent. E-DCH (only UL) can have a minimumrate (a minimum grant) at the configuration. But from that moment it isall controlled by a Node B scheduler involving HARQ re-transmissions onlayer 1.

In one alternative, see FIG. 8, the E-DCH is released. The first RNC 12makes the decision to release the first E-DCH when receiving the failureindication 6 c (1). The first RNC 12 the releases the E-DCH by at leastsending a release control signal to the Node B NB 6 c (3) and the userterminal 6 c (2), with instructions to release the first E-DCH.

The E-DCH channel scheduled grant is mapped by the E-DCH DedicatedPhysical Channel (E-DPDCH), see FIG. 1. The E-AGCH is transmitted via aserving cell created by the first base station while the E-RGCH istransmitted via the serving cell or at least one non-serving cellcreated by at least a second base station. Within the scope of theinvention the downlink transmissions can be sent as an absolutescheduled grant using E-AGCH, but it can also be sent as a serving (fromthe serving cell) relative scheduled grant or non-serving (from anon-serving cell) relative scheduled grant using E-RGCH.

In some cases there might not be enough decoding resources in the Node BNB to handle the scheduled rate used by the UE since it is too high andthen data (e.g. TCP/IP) will not come through which will causecongestion and the UE will finally stop transmitting. But in otherscenarios there might be available decoding resources and decoding canthen be performed in spite of too high scheduled rate. The problem withthis is that this UE causes more UL air interface cell interference thanallowed, which can cause difficulties to detect other channels. Anoption is then that the EUL Scheduler informs the decoding resources andorder this processing unit to drop transmission which is higher thanallowed, which will finally make the UE stop transmitting.

The embodiments refer to a method and a telecommunication system forgrant violation detection and Node B and a radio network controller inthe system enabling said method. The system, Node B and the radionetwork controller in the system are adapted to perform the method stepsas described in the method.

Node B NB is adapted for grant violation detection in the enhanced ULtelecommunication system further comprising at least the first basestation 11 enabling wireless communication with at least the first userterminal UE. The Node B is further adapted for detecting 1B a scheduleddata rate on which the first user terminal UE transmits uplink datatraffic on the first E-DCH. What particularly characterizes Node B isthat it is adapted to control if the scheduled data rate detected ishigher than the maximum data rate, defined by the first E-DCH channelscheduled grant. If the scheduled data rate detected is higher than themaximum data rate, the Node B is further adapted to perform at least thesecond following downlink transmission including the first E-DCH channelscheduled grant.

The radio network controller (RNC) in the enhanced UL telecommunicationsystem is adapted for grant violation detection. At least the first RNCis adapted for establishing at least the first enhanced UL transportchannel (E-DCH) enabling uplink data traffic, with a certain data ratefrom the first user terminal UE at least to the first base station. Whatparticularly characterizes the first RNC is that it is further adaptedfor receiving a failure indication or a radiolink reconfigurationproposal sent to the first RNC, after initiation by the Node B NB.

The enhanced uplink telecommunication system is adapted for grantviolation detection. In the system at least one first radio networkcontroller RNC is adapted to establish at least the first enhanced ULtransport channel (E-DCH), which enables uplink data traffic with acertain data rate from the first user terminal UE at least to the firstbase station. The first user terminal is adapted to calculate from thereceived first E-DCH channel scheduled grant the scheduled data rate forthe uplink data traffic via the first E-DCH. The first user terminal isfurther adapted to transmit the uplink data traffic on the first E-DCHwith the calculated scheduled data rate. The Node B NB in the system isadapted to then detect the scheduled data rate on which the first userterminal transmits. What particularly characterizes the system is thatNode B is adapted to control if the scheduled data rate detected ishigher than the maximum data rate defined by the first E-DCH channelscheduled grant. If the scheduled data rate detected is higher than themaximum data rate, the Node B is further adapted to perform at least asecond following downlink transmission including the first E-DCH channelscheduled grant.

The present invention is not limited to the embodiments described aboveand may be varied freely within the scope of the appended claims.

1. Method for grant violation detection in an enhanced uplink (UL)telecommunication system comprising at least one first base station (11)for enabling wireless communication with at least one first userterminal (UE), at least one first radio network controller (RNC) (12)establishing at least a first enhanced UL transport channel (E-DCH)enabling uplink data traffic with a certain data rate from the firstuser terminal (UE) at least to the first base station (11), the firstE-DCH carrying data for at least one radio access bearer (RAB), at leasta first downlink transmission being performed including a first E-DCHchannel scheduled grant to the first user terminal (UE), the scheduledgrant defining the maximum data rate limit for the uplink data trafficvia the first E-DCH, the first user terminal (UE) calculating ascheduled data rate for the uplink data traffic via the first E-DCH fromthe received first E-DCH channel scheduled grant, the first userterminal (UE) transmitting the uplink data traffic on the first E-DCHwith the calculated scheduled data rate, a Node B (NB) detecting (1B)the scheduled data rate on which the first user terminal (UE) transmits,characterized in that the Node B (NB) further controlling (2) if thescheduled data rate detected is higher than the maximum data ratedefined by the first E-DCH channel scheduled grant, if the scheduleddata rate detected is higher than the maximum data rate (3), the Node B(NB) performs (4) at least a second following downlink transmissionincluding the first E-DCH channel scheduled grant.
 2. Method accordingto claim 1 wherein the first RNC (12) establishes at least one secondE-DCH enabling uplink data traffic with a certain data rate from asecond user terminal to the first base station (11) or a second basestation.
 3. Method according to claim 2 wherein the Node B (NB) performsa first transmission (1A) including a second E-DCH channel scheduledgrant to the second user terminal, the scheduled_grant defining themaximum data rate limit for the uplink data traffic via the secondE-DCH,
 4. Method according to any of the preceding claims wherein theE-DCH transport channel is mapped by the E-DCH Dedicated PhysicalChannel (E-DPDCH).
 5. Method according to claim 4 wherein the Node B(NB) detects the scheduled data rate on the first E-DCH by decoding thedata frames of the uplink data traffic.
 6. Method according to any ofthe claims 4-5 wherein the Node B (NB) detects the scheduled data rateof the uplink data traffic on the E-DCH by decoding the E-DPDCH and/orthe E-DCH Transport Format Combination Indicator (E-TFCI), wherein oneof E-DPDCH and E-TFCI or both are used to derive the actual data rate.7. Method according to any of the preceding claims wherein if thescheduled data rate is higher (3,YES) than the maximum data rate afterthe second following transmission the Node B (NB) performs (4) at leasta third following downlink transmission including the first E-DCHchannel scheduled_grant.
 8. Method according to claim 7 wherein thethird following downlink transmission is followed (4) by at least onefurther following downlink transmission including the first E-DCHchannel scheduled grant until the scheduled data rate detected is equalwith or lower than the maximum data rate.
 9. Method according to any ofthe claims 7-8 wherein the third following downlink transmission isfollowed (4) by at least one further following downlink transmissionuntil the number of following downlink transmissions reaches apredefined value.
 10. Method according to any of the preceding claimswherein the following downlink transmission is transmitted by the Node B(NB) with the same or_a higher power level (x1, x2, x3 . . . xn) thanthe previous transmission.
 11. Method according to claim 10 wherein thedownlink transmission is followed (4(x1),4(x2) by at least one furtherfollowing downlink transmission including the first E-DCH channelscheduled grant until the power level reaches a threshold value. 12.Method according to any of the preceding claims wherein Node B (NB)waits (B) for a period of time after performing (1A,4) a downlinktransmission, after which period it controls (2) again if the scheduleddata rate detected is higher than the maximum data rate defined by thefirst E-DCH channel scheduled grant.
 13. Method according to any of thepreceding claims wherein if (5,YES) the scheduled data rate after apredefined number of following downlink transmissions or after thetransmitted power level reaches a threshold value is still higher thanthe maximum data rate defined by the first E-DCH channel scheduledgrant, the Node B (NB) initiates (6) the sending of a failure indicationor the sending of a radiolink reconfiguration proposal to the first RNC(12).
 14. Method according to claim 13 wherein the first_RNC (12):decides to reconfigure the at least one RAB from the first E-DCH to afirst dedicated channel DCH when receiving the failure indication (6 a(1)) or the radiolink reconfiguration proposal (6 d (1)), the first RNC(12) reconfiguring at least by sending a reconfigure control signal tothe Node B (NB) (6 a (3), 6 d (3)) and the user terminal (UE) (6 a (2),6 d (2)) with instructions to switch from the first E-DCH to the firstDCH.
 15. Method according to claim 13 wherein the first RNC (12):decides to reconfigure the at least one RAB from the first E-DCH to afirst forward access channel (FACH) when receiving the failureindication (6 b (1)), the first RNC (12) reconfiguring at least bysending a reconfigure control signal to the Node B (NB) (6 b (3)) andthe user terminal (UE) (6 b (2)) with instructions to switch from thefirst E-DCH to the first FACH.
 16. Method according to claim 13 whereinthe first RNC (12) decides to release the first E-DCH when receiving thefailure indication (6 c (1)), the first RNC (12) releasing at least bysending a release control signal to the Node B (NB) (6 c (3)) and theuser terminal (UE) (6 c (2)) with instructions to release the firstE-DCH.
 17. Method according to any of the preceding claims wherein theE-DCH channel grant corresponds to at least two physical channels, theenhanced absolute grant channel (E-AGCH) and the enhanced relative grantchannel (E-RGCH).
 18. Method according to claim 17 wherein the E-AGCH istransmitted via a serving cell created by the first base station whilethe E-AGCH is transmitted via the serving cell or at least onenon-serving cell created by at least a second base station.
 19. Methodaccording to any of the preceding claims wherein the first RNC (12)further performs a first downlink transmission including the first E-DCHchannel scheduled grant to the first user terminal (UE) during a RLsetup or reconfiguration before the establishment of the first E-DCH,20. Method according to any of the preceding claims wherein the Node B(NB), which comprises an enhanced UL scheduler (EUL-S), performs (1A) afirst downlink transmission including the first E-DCH channel scheduledgrant to the first user terminal (UE).
 21. A Node B (NB) being adaptedfor grant violation detection in an enhanced UL telecommunication systemfurther comprising at least one first base station (11) for enablingwireless communication with at least one first user terminal (UE), atleast a first enhanced UL transport channel (E-DCH) being establishedenabling uplink data traffic with a certain data rate from the firstuser terminal (UE) at least to the first base station (11), the firstE-DCH carrying data for at least one radio access bearer (RAB), at leasta first downlink transmission being performed including a first E-DCHchannel scheduled grant to the first user terminal (UE), the scheduledgrant defining the maximum data rate limit for the uplink data trafficvia the first E-DCH, the Node B (NB) further being adapted for detecting(1B) a scheduled data rate on which the first user terminal (UE)transmits uplink data traffic on the first E-DCH, characterized in thatthe Node B (NB) further being adapted for controlling (2) if thescheduled data rate detected is higher than the maximum data ratedefined by the first E-DCH channel scheduled grant, if the scheduleddata rate detected is higher than the maximum data rate (3), the Node B(NB) is further adapted for performing (4) at least a second followingdownlink transmission including the first E-DCH channel scheduled grant.22. A Node B (NB) according to claim 21 wherein if the scheduled datarate is higher (3,YES) than the maximum data rate after the secondfollowing transmission the Node B (NB) is further adapted for performing(4) at least a third following downlink transmission including the firstE-DCH channel scheduled grant.
 23. A Node B (NB) according to any of theclaims 21-22 wherein the Node B (NB) is further adapted for transmittingthe following downlink transmission with the same or a higher powerlevel (x1,x2,x3 . . . Xn) than the previous transmission.
 24. A Node B(NB) according to any of the claims 21-23 wherein Node B (NB) is furtheradapted for waiting (B) for a period of time after performing (1A,4) adownlink transmission, after which period it controls (2) again if thescheduled data rate detected is higher than the maximum data ratedefined by the first E-DCH channel scheduled grant.
 25. A Node B (NB)according to any of the claims 21-24 wherein if (5,YES) the scheduleddata rate after a predefined number of following downlink transmissionsor after the transmitted power level reaches a threshold value is stillhigher than the maximum data rate defined by the first E-DCH channelscheduled grant, the Node B (NB) is further adapted for initiating (6)the sending of a failure indication or the sending of a radiolinkreconfiguration proposal to a first radio network controller (RNC) (12).26. A Node B (NB) according to any of the claims 21-25 wherein the firstE-DCH channel scheduled grant is included in a first downlinktransmission sent to the first user terminal (UE) during a RL setup orreconfiguration before the establishment of the first E-DCH.
 27. A NodeB (NB) according to any of the claims 21-26 wherein the Node B (NB),which comprises an enhanced UL scheduler (EUL-S), is further adapted forperforming (1A) a first downlink transmission including the first E-DCHchannel scheduled grant to the first user terminal (UE).
 28. A firstradio network controller (RNC) (12) in an enhanced UL telecommunicationsystem adapted for grant violation detection, the system furthercomprising at least one first base station (11) for enabling wirelesscommunication with at least one first user terminal (UE), the at leastone first RNC (12) being adapted for establishing at least a firstenhanced UL transport channel (E-DCH) enabling uplink data traffic witha certain data rate from the first user terminal (UE) at least to thefirst base station (11), the first E-DCH carrying data for at least oneradio access bearer (RAB), at least a first downlink transmission beingperformed including a first E-DCH channel scheduled grant to the firstuser terminal (UE), the scheduled grant defining the maximum data ratelimit for the uplink data traffic via the first E-DCH, characterized inthat the first RNC (12) is further adapted for receiving a failureindication or a radiolink reconfiguration proposal sent (6 a (1), 6 b(1), 6 c (1), 6 d (1)) to the first RNC (12) after initiation by a NodeB (NB).
 29. A first RNC (12) according to claim 28 wherein the first RNC(12) is adapted for establishing at least one second E-DCH enablinguplink data traffic with a certain data rate from the first (1) or asecond user terminal to the first base station (11) or a second basestation.
 30. A first RNC (12) according to any of the claims 28-29wherein the first RNC (12) is further adapted for deciding toreconfigure the at least one RAB from the first E-DCH to a firstdedicated channel DCH when receiving the failure indication (6 a (1)) orthe radiolink reconfiguration proposal (6 d (1)), the first RNC (12)reconfiguring at least by sending a reconfigure control signal to theNode B (NB) (6 a (3), 6 d (3)) and the user terminal (UE) (6 a (2), 6 d(2)) with instructions to switch from the first E-DCH to the first DCH.31. A first RNC (12) according to any of the claims 28-29 wherein thefirst RNC (12) is further adapted for deciding to reconfigure the atleast one RAB from the first E-DCH to a first forward access channel(FACH) when receiving the failure indication (6 b (1)), the first RNC(12) reconfiguring at least by sending a reconfigure control signal tothe Node B (NB) (6 b (3)) and the user terminal (UE) (6 b (2)) withinstructions to switch from the first E-DCH to the first FACH.
 32. Afirst RNC (12) according to any of the claims 28-29 wherein the firstRNC (12) is further adapted for deciding to release the first E-DCH whenreceiving the failure indication (6 c (1)), the first RNC (12) releasingat least by sending a release control signal to the Node B (NB) (6 c(3)) and the user terminal (UE) (6 c (2)) with instructions to releasethe first E-DCH.
 33. A first RNC (12) according to any of the claims28-32 wherein the first RNC (12) is further adapted for performing afirst downlink transmission including the first E-DCH channel scheduledgrant to the first user terminal (UE) during a RL setup orreconfiguration before the establishment of the first E-DCH.
 34. Anenhanced uplink telecommunication system adapted for grant violationdetection, the system comprising at least one first base station (11)for enabling wireless communication with at least one first userterminal (UE), the system further comprising: at least one first radionetwork controller (RNC) (12) being adapted for establishing at least afirst enhanced UL transport channel (E-DCH) enabling uplink data trafficwith a certain data rate from the first user terminal (UE) at least tothe first base station (11), the first E-DCH carrying data for at leastone radio access bearer (RAB), at least a first downlink transmissionbeing performed including a first E-DCH channel scheduled grant to thefirst user terminal (UE), the scheduled grant defining the maximum datarate limit for the uplink data traffic via the first E-DCH, the firstuser terminal (UE) being adapted for calculating a scheduled data ratefor the uplink data traffic via the first E-DCH from the received firstE-DCH channel scheduled grant, the first user terminal (UE) furtherbeing adapted for transmitting the uplink data traffic on the firstE-DCH with the calculated scheduled data rate, the Node B (NB) furtherbeing adapted for detecting (1B) the scheduled data rate on which thefirst user terminal (UE) transmits, characterized in that the Node B(NB) further being adapted for controlling (2) if the scheduled datarate detected is higher than the maximum data rate defined by the firstE-DCH channel scheduled grant, if the scheduled data rate detected ishigher than the maximum data rate (3), the Node B (NB) is furtheradapted for performing (4) at least a second following downlinktransmission including the first E-DCH channel scheduled grant.